function drawsankey(data){
    const chart = new Chart();

    const config = {
        pointColor: chart._colors[0],
        margins: {top: 10, left: 10, bottom: 10, right: 10},
        textColor: 'black',
        gridColor: 'gray',
        title: '桑葚图',
        pointSize: 5,
        hoverColor: 'white',
        animateDuration: 1000
    };
    chart.width(300);
    chart.height(375);
    chart.margins(config.margins);

  chart.render = function(){

      var units = "Widgets";

    var margin = {top: 10, right: 10, bottom: 10, left: 10},
        width = 300 - margin.left - margin.right,
        height = 375 - margin.top - margin.bottom;

    var formatNumber = d3.format(",.0f"),
        format = function(d) { return formatNumber(d) + " " + units; },
        color = d3.scaleOrdinal(d3.schemeCategory10);

    var svg = d3.select("#chart1").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform",
              "translate(" + margin.left + "," + margin.top + ")");

    var sankey = d3.sankey()
        .nodeWidth(36)
        .nodePadding(40)
        .size([width, height]);

    var path = sankey.link();



      graph = {"nodes" : [], "links" : []};

      data.forEach(function (d) {
        graph.nodes.push({ "name": d.source });
        graph.nodes.push({ "name": d.target });
        graph.links.push({ "source": d.source,
                           "target": d.target,
                           "value": +d.value });
       });

      graph.nodes = d3.keys(d3.nest()
        .key(function (d) { return d.name; })
        .object(graph.nodes));

      graph.links.forEach(function (d, i) {
        graph.links[i].source = graph.nodes.indexOf(graph.links[i].source);
        graph.links[i].target = graph.nodes.indexOf(graph.links[i].target);
      });

      graph.nodes.forEach(function (d, i) {
        graph.nodes[i] = { "name": d };
      });

      sankey
          .nodes(graph.nodes)
          .links(graph.links)
          .layout(32);

      var link = svg.append("g").selectAll(".link")
          .data(graph.links)
        .enter().append("path")
          .attr("class", "link")
          .attr("d", path)
          .style("stroke-width", function(d) { return Math.max(1, d.dy); })
          .sort(function(a, b) { return b.dy - a.dy; });

      link.append("title")
            .text(function(d) {
                return d.source.name + " → " +
                    d.target.name + "\n" + format(d.value); });

      var node = svg.append("g").selectAll(".node")
          .data(graph.nodes)
        .enter().append("g")
          .attr("class", "node")
          .attr("transform", function(d) {
              return "translate(" + d.x + "," + d.y + ")"; })
          .call(d3.drag()
            .subject(function(d) {
              return d;
            })
            .on("start", function() {
              this.parentNode.appendChild(this);
            })
            .on("drag", dragmove));

      node.append("rect")
          .attr("height", function(d) { return d.dy; })
          .attr("width", sankey.nodeWidth())
          .style("fill", function(d) {
              return d.color = color(d.name.replace(/ .*/, "")); })
          .style("stroke", function(d) {
              return d3.rgb(d.color).darker(2); })
        .append("title")
          .text(function(d) {
              return d.name + "\n" + format(d.value); });

      node.append("text")
          .attr("x", -6)
          .attr("y", function(d) { return d.dy / 2; })
          .attr("dy", ".35em")
          .attr("text-anchor", "end")
          .attr("transform", null)
          .text(function(d) { return d.name; })
        .filter(function(d) { return d.x < width / 2; })
          .attr("x", 6 + sankey.nodeWidth())
          .attr("text-anchor", "start");

      function dragmove(d) {
        d3.select(this)
          .attr("transform",
                "translate("
                   + d.x + ","
                   + (d.y = Math.max(
                      0, Math.min(height - d.dy, d3.event.y))
                     ) + ")");
        sankey.relayout();
        link.attr("d", path);
      }


  };

    chart.box(d3.select("#SankyDiv"));
    chart.renderChart();

}
